哈特曼波前传感器及其在FLASH中的应用。
Hartmann wavefront sensors and their application at FLASH.
作者信息
Keitel Barbara, Plönjes Elke, Kreis Svea, Kuhlmann Marion, Tiedtke Kai, Mey Tobias, Schäfer Bernd, Mann Klaus
机构信息
Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany.
Laser-Laboratorium Göttingen e.V., Hans-Adolf-Krebs-Weg 1, 37077 Göttingen, Germany.
出版信息
J Synchrotron Radiat. 2016 Jan;23(1):43-9. doi: 10.1107/S1600577515020354. Epub 2016 Jan 1.
Different types of Hartmann wavefront sensors are presented which are usable for a variety of applications in the soft X-ray spectral region at FLASH, the free-electron laser (FEL) in Hamburg. As a typical application, online measurements of photon beam parameters during mirror alignment are reported on. A compact Hartmann sensor, operating in the wavelength range from 4 to 38 nm, was used to determine the wavefront quality as well as aberrations of individual FEL pulses during the alignment procedure. Beam characterization and alignment of the focusing optics of the FLASH beamline BL3 were performed with λ(13.5 nm)/116 accuracy for wavefront r.m.s. (w(rms)) repeatability, resulting in a reduction of w(rms) by 33% during alignment.
介绍了不同类型的哈特曼波前传感器，它们可用于汉堡自由电子激光（FEL）装置FLASH软X射线光谱区域的各种应用。作为一个典型应用，报告了在反射镜对准过程中对光子束参数的在线测量。使用了一种紧凑的哈特曼传感器，其工作波长范围为4至38纳米，用于在对准过程中确定单个FEL脉冲的波前质量以及像差。对FLASH光束线BL3的聚焦光学元件进行了光束表征和对准，波前均方根（w(rms)）重复性达到λ(13.5纳米)/116精度，对准过程中w(rms)降低了33%。
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